Shellshock - minutae

I am pretty sure there is a difference in the versions of Shellshock on Substance and on Retro. Maybe this has been picked up before, but in the discography, both are referred to as the John Robie remix, but there is definately some backing vocals on the Substance version that are not on the Retro version. Am I missing something (apart from a life?)

Yours pedantically

I've always wondered the difference myself, but I've never been arsed to look

Always thought it was the same version,i cant be arsed comparing them but if you want the 'other' version,you can find it on the soundtrack to "Pretty In Pink" which,if im correct is the only place to find it on CD. Oh and the 7" mix is on the UK edition of The Best Of.